Evidence for single top-quark production in the ss-channel in proton-proton collisions at s√=s=8 TeV with the ATLAS detector using the Matrix Element Method

Fabrice Balli; Sarah Barnes; Brian Cox; Cinzia Da Via; Giulio Forcolin; Alessandra Forti; Julia Iturbe Ponce; Kiran Joshi; Houry Keoshkerian; Xingguo Li; F. K. Loebinger; Stephen Marsden; Jiri Masik; Francisca Munoz Sanchez; Thomas Neep; Alexander Oh; Rustem Ospanov; Joleen Pater; Yvonne Peters; Andrew Pilkington; Arnaud Pin; Darren Price; Yang Qin; Michaela Queitsch-Maitland; Christian Schwanenberger; Hansdieter Schweiger; Savanna Shaw; Raymond Thompson; Lee Tomlinson; Stephen Watts; Samuel Webb; Martin Woudstra; Terence Wyatt; ATLAS Collaboration

doi:10.1016/j.physletb.2016.03.017

Evidence for single top-quark production in the ss-channel in proton-proton collisions at s√=s=8 TeV with the ATLAS detector using the Matrix Element Method

Fabrice Balli, Sarah Barnes, Brian Cox, Cinzia Da Via, Giulio Forcolin, Alessandra Forti, Julia Iturbe Ponce, Kiran Joshi, Houry Keoshkerian, Xingguo Li, F. K. Loebinger, Stephen Marsden, Jiri Masik, Francisca Munoz Sanchez, Thomas Neep, Alexander Oh, Rustem Ospanov, Joleen Pater, Yvonne Peters, Andrew PilkingtonArnaud Pin, Darren Price, Yang Qin, Michaela Queitsch-Maitland, Christian Schwanenberger, Hansdieter Schweiger, Savanna Shaw, Raymond Thompson, Lee Tomlinson, Stephen Watts, Samuel Webb, Martin Woudstra, Terence Wyatt, ATLAS Collaboration

Research output: Contribution to journal › Article › peer-review

Abstract

This Letter presents evidence for single top-quark production in the s-channel using proton–proton collisions at a centre-of-mass energy of 8TeV with the ATLAS detector at the CERN Large Hadron Collider. The analysis is performed on events containing one isolated electron or muon, large missing transverse momentum and exactly two b-tagged jets in the final state. The analysed data set corresponds to an integrated luminosity of 20.3fb−1. The signal is extracted using a maximum-likelihood fit of a discriminant which is based on the matrix element method and optimized in order to separate single-top-quark s-channel events from the main background contributions, which are top-quark pair production and W boson production in association with heavy-flavour jets. The measurement leads to an observed signal significance of 3.2 standard deviations and a measured cross-section of σs=4.8±0.8(stat.)−1.3+1.6(syst.) pb, which is consistent with the Standard Model expectation. The expected significance for the analysis is 3.9 standard deviations.

Original language	English
Pages (from-to)	228-246
Number of pages	19
Journal	Physics Letters B
Volume	756
Early online date	8 Mar 2016
DOIs	https://doi.org/10.1016/j.physletb.2016.03.017
Publication status	Published - 8 Mar 2016

Access to Document

10.1016/j.physletb.2016.03.017Licence: CC BY

Cite this

Balli, F., Barnes, S., Cox, B., Da Via, C., Forcolin, G., Forti, A., Iturbe Ponce, J., Joshi, K., Keoshkerian, H., Li, X., Loebinger, F. K., Marsden, S., Masik, J., Munoz Sanchez, F., Neep, T., Oh, A., Ospanov, R., Pater, J., Peters, Y., ... ATLAS Collaboration (2016). Evidence for single top-quark production in the ss-channel in proton-proton collisions at s√=s=8 TeV with the ATLAS detector using the Matrix Element Method. Physics Letters B, 756, 228-246. https://doi.org/10.1016/j.physletb.2016.03.017

@article{798f5d99cd984a1982c279024a614640,

title = "Evidence for single top-quark production in the ss-channel in proton-proton collisions at s√=s=8 TeV with the ATLAS detector using the Matrix Element Method",

abstract = "This Letter presents evidence for single top-quark production in the s-channel using proton–proton collisions at a centre-of-mass energy of 8TeV with the ATLAS detector at the CERN Large Hadron Collider. The analysis is performed on events containing one isolated electron or muon, large missing transverse momentum and exactly two b-tagged jets in the final state. The analysed data set corresponds to an integrated luminosity of 20.3fb−1. The signal is extracted using a maximum-likelihood fit of a discriminant which is based on the matrix element method and optimized in order to separate single-top-quark s-channel events from the main background contributions, which are top-quark pair production and W boson production in association with heavy-flavour jets. The measurement leads to an observed signal significance of 3.2 standard deviations and a measured cross-section of σs=4.8±0.8(stat.)−1.3+1.6(syst.) pb, which is consistent with the Standard Model expectation. The expected significance for the analysis is 3.9 standard deviations.",

author = "Fabrice Balli and Sarah Barnes and Brian Cox and {Da Via}, Cinzia and Giulio Forcolin and Alessandra Forti and {Iturbe Ponce}, Julia and Kiran Joshi and Houry Keoshkerian and Xingguo Li and Loebinger, {F. K.} and Stephen Marsden and Jiri Masik and {Munoz Sanchez}, Francisca and Thomas Neep and Alexander Oh and Rustem Ospanov and Joleen Pater and Yvonne Peters and Andrew Pilkington and Arnaud Pin and Darren Price and Yang Qin and Michaela Queitsch-Maitland and Christian Schwanenberger and Hansdieter Schweiger and Savanna Shaw and Raymond Thompson and Lee Tomlinson and Stephen Watts and Samuel Webb and Martin Woudstra and Terence Wyatt and {ATLAS Collaboration}",

year = "2016",

month = mar,

day = "8",

doi = "10.1016/j.physletb.2016.03.017",

language = "English",

volume = "756",

pages = "228--246",

journal = "Physics Letters B",

issn = "0370-2693",

publisher = "Elsevier BV",

}

Balli, F, Barnes, S, Cox, B, Da Via, C, Forcolin, G, Forti, A, Iturbe Ponce, J, Joshi, K, Keoshkerian, H, Li, X, Loebinger, FK, Marsden, S, Masik, J, Munoz Sanchez, F, Neep, T, Oh, A, Ospanov, R, Pater, J, Peters, Y , Pilkington, A, Pin, A, Price, D, Qin, Y, Queitsch-Maitland, M, Schwanenberger, C, Schweiger, H, Shaw, S, Thompson, R, Tomlinson, L, Watts, S, Webb, S, Woudstra, M, Wyatt, T & ATLAS Collaboration 2016, 'Evidence for single top-quark production in the ss-channel in proton-proton collisions at s√=s=8 TeV with the ATLAS detector using the Matrix Element Method', Physics Letters B, vol. 756, pp. 228-246. https://doi.org/10.1016/j.physletb.2016.03.017

TY - JOUR

T1 - Evidence for single top-quark production in the ss-channel in proton-proton collisions at s√=s=8 TeV with the ATLAS detector using the Matrix Element Method

AU - Balli, Fabrice

AU - Barnes, Sarah

AU - Cox, Brian

AU - Da Via, Cinzia

AU - Forcolin, Giulio

AU - Forti, Alessandra

AU - Iturbe Ponce, Julia

AU - Joshi, Kiran

AU - Keoshkerian, Houry

AU - Li, Xingguo

AU - Loebinger, F. K.

AU - Marsden, Stephen

AU - Masik, Jiri

AU - Munoz Sanchez, Francisca

AU - Neep, Thomas

AU - Oh, Alexander

AU - Ospanov, Rustem

AU - Pater, Joleen

AU - Peters, Yvonne

AU - Pilkington, Andrew

AU - Pin, Arnaud

AU - Price, Darren

AU - Qin, Yang

AU - Queitsch-Maitland, Michaela

AU - Schwanenberger, Christian

AU - Schweiger, Hansdieter

AU - Shaw, Savanna

AU - Thompson, Raymond

AU - Tomlinson, Lee

AU - Watts, Stephen

AU - Webb, Samuel

AU - Woudstra, Martin

AU - Wyatt, Terence

AU - ATLAS Collaboration

PY - 2016/3/8

Y1 - 2016/3/8

N2 - This Letter presents evidence for single top-quark production in the s-channel using proton–proton collisions at a centre-of-mass energy of 8TeV with the ATLAS detector at the CERN Large Hadron Collider. The analysis is performed on events containing one isolated electron or muon, large missing transverse momentum and exactly two b-tagged jets in the final state. The analysed data set corresponds to an integrated luminosity of 20.3fb−1. The signal is extracted using a maximum-likelihood fit of a discriminant which is based on the matrix element method and optimized in order to separate single-top-quark s-channel events from the main background contributions, which are top-quark pair production and W boson production in association with heavy-flavour jets. The measurement leads to an observed signal significance of 3.2 standard deviations and a measured cross-section of σs=4.8±0.8(stat.)−1.3+1.6(syst.) pb, which is consistent with the Standard Model expectation. The expected significance for the analysis is 3.9 standard deviations.

AB - This Letter presents evidence for single top-quark production in the s-channel using proton–proton collisions at a centre-of-mass energy of 8TeV with the ATLAS detector at the CERN Large Hadron Collider. The analysis is performed on events containing one isolated electron or muon, large missing transverse momentum and exactly two b-tagged jets in the final state. The analysed data set corresponds to an integrated luminosity of 20.3fb−1. The signal is extracted using a maximum-likelihood fit of a discriminant which is based on the matrix element method and optimized in order to separate single-top-quark s-channel events from the main background contributions, which are top-quark pair production and W boson production in association with heavy-flavour jets. The measurement leads to an observed signal significance of 3.2 standard deviations and a measured cross-section of σs=4.8±0.8(stat.)−1.3+1.6(syst.) pb, which is consistent with the Standard Model expectation. The expected significance for the analysis is 3.9 standard deviations.

U2 - 10.1016/j.physletb.2016.03.017

DO - 10.1016/j.physletb.2016.03.017

M3 - Article

SN - 0370-2693

VL - 756

SP - 228

EP - 246

JO - Physics Letters B

JF - Physics Letters B

ER -

Evidence for single top-quark production in the ss-channel in proton-proton collisions at s√=s=8 TeV with the ATLAS detector using the Matrix Element Method

Abstract

Access to Document

Fingerprint

Cite this